RBG is part of the old, old school communists. She was already 24 in 1960 when all that communist adoration in America really started up in earnest, especially in the Jewish community. She was there. And, she was an adult at the outset.
I think it is deep seeded in her. And even though Russia is supposedly the bad guy now by the Left, I think that attitude is so ingrained in her, especially at her age, she cannot get over it.